1. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita 565-0871, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima 890-0065, Japan; and Tsukuba Research Laboratory, NOF Corporation, 5-10 Tokodai, Tsukuba 300-2635, Japan